Carburetor



J. B. DUTOUR Nov. 13, 1923 CARBURETOR Filed April 14 1920 INVENTOR Jeczzz Efieziazzn ATTORNEYS Patented Nov. 135, 1%23.

FHQE.

JEAN B. DUTOUR, OF SAN FRANCISCO, CALIFORNIA.

OARBURETOR.

To all whom it may concern Be it known that l, JEAN B. Doreen, a citizen of the United States, and a resident of the city and county of San Francisco State of California, have invented a new and useful Carburetor, of which the follow ingis a specification.

This invention relates particularly to a carburetor for the mixture of highly combustible gases and air in such proportions as to secure combustion of the mixture with such degree of pressure as will be safe in the 0 aeration of internal combustion engines.

With the rapidly decreasing supply of liquid fuel for consumption in internal combustion engines and with the consequent increase in the cost of the fuel now marketed it becomes desirable to utilize otherand cheaper kinds of fuel.

It is therefore, one of the objects of the present invention to provide means for the practical utilization of a highly. combustible gas or gases for the operation of internal combustion engines.

It is another object of the present inven tion to provide means for properly mixing a highly combustible gas and air so that the mixture. can be safely introduced into and exploded in the chambers of combustion engines at degrees of pressure not above the danger limit. r

A further object of the invention is to provide for the automatic reduction of the pressureof a gaseous combustible fuel from asource in which it is compressed to com paratively high degree, and for maintaining a supply ofthe combustible gas at a reduced pressure, and forauto'matically admitting it into a mixing chamber to be mixed with a properproportion of air.

A further object of the invention is to provide'a carburetor for mixing a highly combustible gas with air, and to provide meansfor controlling theadmission of a combustible gas from asupply under considerable pressure into a reduced pressure chamber, and further to provide means for regulating or varying the proportion of gas and air in a mixing chamber.

Further it is an object of the'invention to provide an automatically acting, pressure reducing means and to provide for the manual control or adjustment of said means.

Another object of the invention is to pro- Application filed August 14, 1920. Serial No. 408,483.

vide a carburetor of compact construction and organization, of simple elements and which provide for the ready inspection, removal and renewal of the parts as may be necessary.

The invention possesses other objects and features of advantage, some of which, with the foregoing, will be made manifest in the following description of the preferred form of the invention which is illustrated in the drawings accompanying and forming part of the specification. It is to be understood that it is not intended to limit the invention to the embodiment shown by the said drawings and description as variations may be adopted within the scope of the. invention as set forth in the claims.

Referring to the drawings:

Fig. 1 is a plan View of the improved carburetor.

Fig. 2 is a central, axial section of the same.

Numerous kinds of highly explosive or combustible gases are easily obtained and several are now commercially marked and distributed in containers in which the gases are maintained under comparatively high pressure. 1 Acetylene or calcium carbide gas, is a common and well known" combustible medium readily obtainable in the open market, and the present invention has for its purpose to enable the utilization of acetylene or other gas for the operation of internal combustion engines.

The present invention embodies a carburetor in which there is a mixing chamber with a suction or outlet port through which a combustible mixture can be drawn into an engine; means being provided for the ad mission of the combustiblegas and a proper proportion of air into the mixing chamber. Further, the invention embodies means for the automatic reduction of the pressure of the combustible in cases where the carburetor is receiving the gas from a source of supply in which the gas is under considerable pressure. Means are also provided for manually regulating or controlling the pressure reducing mechanism, and also for controlling the richness of the mixture independently of the gas controlling mechanism.

The carburetor as shown, comprises a body or shell 2 of any suitable material and proportions, and is provided with an air inlet flue or passage 3 in which there may be provided a suitable form of valved arranged on a rock shaft to which is connected a lever .6 from which extends a reach link 7 by the operation of which the position of the valve 1 may be controlled. The air passage 3 leads into a mixing chamber 8 into which the flow of air is controlled by an automatic valve 9.

The mixing chamber 8 is provided with a port 10 closable by a valve 11 and communicating with; reduced-pressure gas chamber 12. The wall of the reduced-presstu'e chamber 12, opposite to the valve 11, may be provided with a removable plug 13 cover ing an opening through which the valvell may be inserted and removed;

A combustible gas from any source of supply may be introduced into the reducedpressure chamber 1 at a desired degree of pressure and will, when the valve 11 is opened, pass into the mixing chamber and mix therein with air admitted into the mixing chamber when the air valve 9 is opened.

Preferably the valves?) and 11 are concurrently operable and are therefore suitably connected to move together. The va ve 11 is shownas provided with' a stem 1+1 passing through a bearing 15 and on which stem the valve 9 is mounted in a variable 'or adjustable position with respect to the valve 11, such position being determined by the stop collar 16.. The lower end of the stem 14 passes through a bearing 17, disposed in the air intake flue 3.

As it is preferred that the combustible gas be maintained in the pressure chamber 12 at a pressure somewhat above, that existing in the mixing chamber 3 during the operation of the engine, the valves 11 and9 are preferably of diflerentialarea; the air valve being the larger so that upon suction'in the mixing chamber, which has a suction outlet 18, atmospheric pressure against the air i11- let valve 9 causes it to rise admitting air to the mixing chamber and at the same time lifting the gas valve 11 from its seat and allowing gas to flow into the mixing chamber. V v

A further and important feature of the invention is provision for automatically delivering into the gas chamber 12 a supply of gas from a source, such as a tank not shown, in which the gas is maintained at a considerable pressure. Such provision for admitting gas to the gas chamber also is designed to automatically reduce the pressure from the source of supply to the desired degree in the gas chamber 12. There is therefore provided, relative to the gas chamber 12 a gas inlet port leading from a chamber 21 in which is a piston valve 22 arranged on a stem 23 extending upwardly through a cap or hearing 24. The outer end of the valve stem or rod 23 is provided with a sliding collar 25 opposed on opposite sides by springs 26 and 27, the latter bearing against an adjustable nut 28 on the threaded end 29 of the valve rod. The spring 26 reacts against a collar 30 on the valve rod. The valve rod 23 projects from one side of the ,pistonvalve 22 and has a reduced portion 23 passing through an axial, constricted port 31; one side of the port 31 being provided with a seat32 to receive a. valve 33 mounted on the end of the stem 23 and which valve operates in a highpressure gas inlet chamber 34. The valve 33 and connected piston 22 comprise a differential valve. Gas under high pressure may be supplied to the chamber 3%, suitable connections 35 leading to a gas tank not shown.

1n the operation; of the engine any de sired degree of pressure may be maintained in the gas chamber 12 by the regulation of the pressure of the spring 26 on thecollar 30 of the valve stem 23, this pressure tending to open the valve 33 against the pressure of the gas in the chamber 34. Manual or other control of the pressure of the spring 26 is secured by attaching to the sliding collar-'25 a link or links 36 attached to a lever attached to a reach link 40 that may be ex:

tended to within convenient reach of'the operator. Movement of'the' adjustable pres sure collar 25 down upon the spring 26 causes it to react and press the valve 33 from its seat admitting gas into thevalve chamber 21, thence through the port 20 into gas chamber 12. As pressure accumulates" in the chamber 21 suiiiciently to overcome the pressure of the spring 26, the valve 33 is again closed this being accomplished by the pressure of the gas upon the piston portion 22 of the differential valve; It will therefore be seen that upon settingof the regulator 25, a substantially constant pressure will be maintained thegas chamber 12 by the opening and closing of the valve 33in consequence of escape of gas as the valve 11 7 opens to admit it into the mixing chamber 8. The richness of the mixture inthe cha ber 8 may be controlled byjthe adjustment of the air valve 4 since the closing movement of this valve will decrease the quantity of air passing around the valve 9 which is opened by suction in the mixing chamber 8 while a substantially constant proportion of gas is admitted by the valve 11 when it opens.

What is claimed is:

1. A carburetor for mixing a combustible gas from a supply under pressure and air at about atmospheric pressure, comprising a casing having a mixing chamber with a suction outlet and an air inlet,'a gas chamber, differential valvular means for stepping down the pressure of said combustible gas and admitting it to said gas chamber, and automatic, combined differential valves for admitting air, and gas from the gas chamher, to the mixing chamber.

2. A carburetor for mixing a combustible gas "from a supply under pressure and air at about atmospheric pressure, comprising a casing having a mixing chamber and a gas chamber, coordinated valves for regulating the flow of gas from the gas chamber and the flow of air to said mixing chamber, a high pressure gas inlet, a differential valve controlling the gasfiovv from said inlet to said chamber, a spring tending to open said differential valve and means for vary ing the tension of said spring.

3. A carburetor for mixing a combustible from a supply under pressure and air at about atmospheric pressure, comprising a casing having a mixing chamber and a gas chamber, co-ordinated valves for regulating the flow of gas from the gas chamber and the flow of air to said mixing chamber, a high pressure gas inlet, a differential valve controlling the gas flow from said inlet to said gas chamber, and means for varying the operative pressure of said diiierential valve.

4. A carburetor for mixing a combustible gas from a supply under pressure and air at about atmospheric pressure, comprising a casing having a mixing chamber and a gas chamber, co-ordinated valves for regulating the flow of gas from the gas chamber and the flow of air to said mixing chamber, a high pressure gas inlet, a diiferential valve controlling the gas flow from said inlet to said gas chamber and having a stem thereon, a collar loose on said stem, a spring interposed between said collar and said stem on both sides of said collar, and means for moving said collar to vary the position of said differential valve.

5. A carburetor for mixing a combustible gas from a supply under pressure and air at about atmospheric pressure, comprising a casing having a mixing chamber and a gas chamber, co-ordinated valves for regulating the flow of gas from the gas chamber and the flow of air to said mixing chamber, a

high pressure gas inlet, a difierential valve controlling the gas flow from said inlet to said gas chamber, means for bodily shifting said differential valve and resilient means interposed between said differential valve and said shifting means.

In testimony whereof, I have hereunto set my hand.

JEAN B. DUTOUR. 

